From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: Re: Skylake graphics regression: projector failure with 4.8-rc3 Date: Fri, 26 Aug 2016 09:11:42 -0400 Message-ID: <1472217102.5189.51.camel@HansenPartnership.com> References: <1472217035.5189.50.camel@HansenPartnership.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1472217035.5189.50.camel@HansenPartnership.com> Sender: linux-kernel-owner@vger.kernel.org To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: linux-kernel List-Id: dri-devel@lists.freedesktop.org On Fri, 2016-08-26 at 09:10 -0400, James Bottomley wrote: > We seem to have an xrandr regression with skylake now. What's > happening is that I can get output on to a projector, but the system > is losing video when I change the xrandr sessions (like going from a > --above b to a --same-as b). The main screen goes blank, which is > basically a reboot situation. Unfortunately, I can't seem to get the > logs out of systemd to see if there was a dump to dmesg (the system > was definitely responding). > > I fell back to 4.6.2 which worked perfectly, so this is definitely > some sort of regression. I'll be able to debug more fully when I get > back home from the Linux Security Summit. Sorry, ignore the logs: they're from a previous bug; as I said I'll try to gather logs when I get back to a more controlled environment over the weekend. James